l67ss Posted September 1, 2013 Report Share Posted September 1, 2013 Unhooked and plugged off my tranny vaccumn modulater now it idles better shifts better AND smoother and it sounds better guessin bad shift modulater? Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted September 1, 2013 Report Share Posted September 1, 2013 sounds like it. sometimes they fail by the plunger diaphragm rupturing and suck trans fluid through the vacuum line. sometimes the vacuum line itself is the entire problem. Quote Link to comment Share on other sites More sharing options...
l67ss Posted September 1, 2013 Author Report Share Posted September 1, 2013 I hav had to periodically add atf bout one half to a full quart a month sounds like it. sometimes they fail by the plunger diaphragm rupturing and suck trans fluid through the vacuum line. sometimes the vacuum line itself is the entire problem. Quote Link to comment Share on other sites More sharing options...
l67ss Posted September 1, 2013 Author Report Share Posted September 1, 2013 Prolly not even gonna change it ill jus leave it capped off drives better that way than it did wen da valve was working right even the brakes feel bettet Quote Link to comment Share on other sites More sharing options...
l67ss Posted September 1, 2013 Author Report Share Posted September 1, 2013 Bout like an old th350 then sounds like it. sometimes they fail by the plunger diaphragm rupturing and suck trans fluid through the vacuum line. sometimes the vacuum line itself is the entire problem. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted September 1, 2013 Report Share Posted September 1, 2013 they actually use the same modulator. that's how we get adjustable modulators a lot of the time, since very few places list them for a 4T60E. Quote Link to comment Share on other sites More sharing options...
Schurkey Posted September 1, 2013 Report Share Posted September 1, 2013 (edited) If your transmission shifts "better" without the modulator being connected to vacuum, either you have an odd sense of "better" (high rpm shift points and harsh shifts) or your transmission is in deep, deep trouble. As for the engine running better, could be you have a massive vacuum leak in the vacuum plumbing; or the engine simply did not appreciate sucking trans fluid into the intake manifold. A proper repair of the modulator system should result in retaining the improved idle, along with proper and realistic transmission pressures and shift points/shift quality. Edited September 1, 2013 by Schurkey Quote Link to comment Share on other sites More sharing options...
l67ss Posted September 1, 2013 Author Report Share Posted September 1, 2013 It shifted like a granny car b4 the valve went bad not to worried about it as im goin sc 3.8/4t65 the filter does need changed If your transmission shifts "better" without the modulator being connected to vacuum, either you have an odd sense of "better" (high rpm shift points and harsh shifts) or your transmission is in deep, deep trouble. As for the engine running better, could be you have a massive vacuum leak in the vacuum plumbing; or the engine simply did not appreciate sucking trans fluid into the intake manifold. A proper repair of the modulator system should result in retaining the improved idle, along with proper and realistic transmission pressures and shift points/shift quality. Quote Link to comment Share on other sites More sharing options...
l67ss Posted September 1, 2013 Author Report Share Posted September 1, 2013 Kool they actually use the same modulator. that's how we get adjustable modulators a lot of the time, since very few places list them for a 4T60E. Quote Link to comment Share on other sites More sharing options...
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